(2)Safety valve : The safety valve opens when there is an abnormal increase in internal pressure caused by overcharging or misusage. Gas is released from the battery to return the pressure back to normal.

(3) Container and covers: Container and covers are made of ABS or PP resin, with superior strength and acid resistance characteristics. The container and covers are sealed to prevent electrolyte and gas leakage.

(4) Other parts :Some other parts of this model,like terminal,case,terminal protector.electrolyte.active materials are in good quality.You can check the quality by sample.